1597681697 has 2 divisors, whose sum is σ = 1597681698. Its totient is φ = 1597681696.

The previous prime is 1597681667. The next prime is 1597681703. The reversal of 1597681697 is 7961867951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966215056 + 631466641 = 31084^2 + 25129^2 .

It is a cyclic number.

It is not a de Polignac number, because 1597681697 - 2³⁰ = 523939873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1597681667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 798840848 + 798840849.

It is an arithmetic number, because the mean of its divisors is an integer number (798840849).

Almost surely, 2^1597681697 is an apocalyptic number.

It is an amenable number.

1597681697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1597681697 is an equidigital number, since it uses as much as digits as its factorization.

1597681697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5715360, while the sum is 59.

The square root of 1597681697 is about 39971.0107077617. The cubic root of 1597681697 is about 1169.0419256405.

The spelling of 1597681697 in words is "one billion, five hundred ninety-seven million, six hundred eighty-one thousand, six hundred ninety-seven".